Instruction manual

5
Additional Gigabit Features
Master/Slave Mode
The Master/Slave mode feature determines which clock will be used between the
iMcV-Gigabit and the device it is connected to (a switch, NIC, or another iMcV-
Gigabit, etc). Slave mode (S1-2 is ON) is the default setting. In Slave mode, iMcV-
Gigabit will receive and use the clock of the connected device. Master mode uses
iMcV-Gigabit's clock. The Master/Slave mode is only valid for the twisted pair link
and is hardware configurable only.
On the iMcV-Gigabit (-00) module, Master/Slave modes are referred to as
Switch/Repeater modes; Switch is the Master mode and Repeater is the Slave mode.
Check the Installation Troubleshooting section on page 11 if you are having difficulty
linking up.
Preferred/Forced Mode
In addition to Master/Slave modes, iMcV-Gigabit (-10) modules also include
Preferred/Forced modes for Master/Slave negotiation. Preferred mode helps
determine whether the module should act as a Master or Slave. Forced Mode should
typically only be used when connecting to some legacy switches, or when there is
difficulty establishing a link. The default is Preferred mode (S1-1 is ON). This feature
is hardware configurable only.
Since most switches today typically function as Masters, IMC Networks recommends
configuring iMcV-Gigabit (-10) modules as indicated in the following chart:
DIP Switch Setting
S1-1 On-Preferred
S1-2 On-Slave
Duplex Mode on iMcV-Gigabit (-00)
The Duplex mode settings of the iMcV-Gigabit (-00) converter are used with Auto-
Negotiation. The default duplex mode for iMcV-Gigabit (-00) is Full-Duplex. In this
mode, the module advertises Full-Duplex during Auto-Negotiation. To make the unit
advertise and operate in Half-Duplex, move DIP switch 1 to the OFF position. Auto-
Negotiation takes place on the twisted-pair interface only. When the twisted-pair
interface is resolved, the configuration will be encoded into the fiber side. No Auto-
Negotiation takes place on the fiber side. As a result, it is usually best to disable
Auto-Negotiation on the remote fiber end. Since most gigabit networks run at Full-
Duplex, IMC Networks recommends setting the remote fiber end to Full-Duplex.
6
NOTE
Setting the duplex mode on iMcV-Gigabit (-10) modules is not required; auto-
negotiation functionality includes the duplex setting.
FX Negotiation on iMcV-Gigabit (-10)
iMcV-Gigabit (-10) modules include the FX Negotiation feature which negotiates
duplex mode. The default for this feature is disabled. You must enable or disable
this feature on both ends of the connection or you may have difficulty establishing a
link. If the device you are connecting to the iMcV-Gigabit module does not support
auto-negotiation, disabling the feature on the iMcV-Gigabit module forces the link
up. The following table shows various configurations and the resulting link status:
FX Auto-Negoitation on a
Switch or iMcV-Gigabit
FX Auto-Negotiation
on iMcV-Gigabit (S5)
Link Status
iMcV-Gigabit-Off OFF Link
iMcV-Gigabit-ON ON Link
iMcV-Gigabit-Off ON No Link
Switch-ON OFF No Link
Switch-ON ON Link
Switch-OFF OFF Link
Switch-OFF ON Link
Installing an iMcV Module
iMcV Modules install in IMC Networks’ SNMP-manageable media converter chassis
or in any MediaChassis. To install an iMcV Module, remove the blank bracket
covering the slot where the module is to be installed by removing the screws on the
outside edges of the bracket. Slide the iMcV Module into the chassis, via the
cardguides, until the module is seated securely in the connector. Secure the module
to the chassis by tightening the captive screw. Save any “blanks” removed during
installation for future use if the configuration requirements change.
Installation Tips
When testing, IMC Networks recommends testing modules first in an unmanaged
environment. To do this, disable management (turn management off or remove the
management module from the chassis), follow the unmanaged configuration
instructions, then install the unit, connect the cables and test the LEDs. When
finished, re-activate management and configure the unit via the software. Since
single-strand fiber products use optics that transmit and receive on two
different wavelengths, you must deploy single-strand fiber products in pairs, or
connect two compatible IMC Networks single-strand fiber products. For example,
connect iMcV-Gigabit, TX/SSFX-SM1310-SC (which has 1310 xmt and 1550 rcv) to a